It expands due to the fact the mercury reacts to heat in such a way that makes it rise up the tube.
Ask this question again, you're going to need a more specific time the president has done this. however, if you are asking about WWI, the USS Lusitania, the Zimmerman Telegram, German U Boats targeting American ships, and so on.
Answer:
In the 1988 Seoul games, Lemieux abandoned his chance to win gold in the Finn class sailing competition to help a competitor who's boat had capsized.
Explanation:
Because of this Lawrence was awarded the Pierre de Coubertin medal for sportsmanship, one of only sixteen athletes to ever win the medal.
Literacy tests were intended for African Americans.